As several colleagues have said, in the case that you have presented there would be practically no problem since the M60A1 AOS is from 1972 and the APDS M728 is from 1974 (the British version would be from 1973). On the other hand, the T-55A would be of 1963, the 3BM-8 of 1968 and the 3BM-25 of 1978, which gives the T-55A a wider margin in its ammunition, which on the other hand is not important due to the low performance of its bullets.
As I said, the case you have presented would not be valid, but in the game there are several cases that are clearly an aberration, such as:
1:The M69A1 RISE Passive. This vehicle entered service at the end of the 80s, it carries the M735 as best ammunition, which is from 1978, but it does not carry the M774 from 1980 or the M883 from 1983, even by dates it could have reached using the M900, the thing is that I couldn’t possibly shoot it since that model of barrel would not withstand the pressure of the bullet.
2:The Magach 3 ERA. In this case we move on to one of the most absurd cases, and I think this is because it is a premium tank that has been around for years and was originally a different version, and since the developers are lazy They do not modify anything. The Magach 3 ERA is from around the beginning of the 80s, and as the best ammunition it has the HEAT-FS M456 from 1966 and the APDS M392A1 from 1961, in short, it is a tank with ammunition almost 20 years older than it. ,and apart from that we have in the Tech Tree the Magach 5, which is literally the same tank, but in that case it does use the ammunition it should, the APDS-FS M111, the most serious thing being that both tanks are Br 8.0, one having a much better bullet than the other.
3:The three T-54s. In this case I think that again it is something that happens due to the laziness of the devs and because they do not worry about decompressing the Br by adding new vehicle models for the Tech Tree. The T-54s, like their name indicates they are from 1947, 1949 and 1951, the 1947 model uses the BR-412D as its best ammunition, which is from 1953, this tank being such an early model that it possibly did not even use the BR-412B. The 1949 model It uses the APDS 3BM-8 as the best ammunition, which is from 1968, when the 1949 model would at most use the BR-412B. The 1951 model has the APDS 3BM-8 and the HEAT-FS 3BK-5 as the best ammunition. of 1955, so in reality the 1951 model, possibly the best bullet, should have the BR-412D. As I said before, in my opinion this is a clear example of compression of the Br, since the Br of these should be changed T-54, lowering it and giving them their historical ammunition, and in its place adding, for example, the T-54A.
The point is that there is discrepancy BOTH ways, while youre trying to develop a narrative where russia is the only one bennefited with them, which is not always the case, not to mention that the specific case that the op used as argument falls apart once you take al look to other vehicles at 8.3.
Which is also kinda the case with the 3bm60, sure m829a2 or dm63 are older, but that does not mean that there arent other rounds as new as the 3bm60, they type 10 is a clear example about it, while also being better.
Btw another discrepancy that you pointed out, france lacking he isnt also a case of russians getting preferencial treatment, as other nato nations also have he rounds, it is just another example of gaijin not caring about france.
I have an M1A1 and A10 ive used my A10 against pantsirs and killed them if i had an F-16C itd be even easier to kill them, ive done the same with my G-lynx while spading the challenger 2
Our best shell is literally L27A1 there’s nothing else to add for britain other than whatever new shell germany will get in the future like Dm73 or EKE and it’ll only be on the CR3